Την Τετάρτη 18 Φεβρουαρίου στις 12:00 μ.μ. ο Sašo Grozdanov (University of Edinburgh) θα δώσει ένα διαδικτυακό σεμινάριο.

Η ομιλία θα αναμεταδοθεί μέσω Zoom στον ακόλουθο σύνδεσμο:
https://authgr.zoom.us/j/92582658652?pwd=mfwK1bUjltrFg59m6SJWDMz3gkwTSd.1

Meeting ID: 925 8265 8652
Passcode: 303704

Ακολουθούν ο τίτλος και η περίληψη της ομιλίας.

Τίτλος: Spectra of black hole perturbations and the spectral duality relation

Περίληψη: Perturbations of black holes generate fluctuations in spacetime known as gravitational waves. In an (approximately) asymptotically flat universe, the spectra of damped gravitational waves (the quasinormal modes) in the two channels of black hole perturbations (longitudinal and transverse) are related by the so-called isospectrality property. In this talk, I will present a new universal spectral duality relation that connects the quasinormal mode spectra in spacetimes with a negative cosmological constant. Through the AdS/CFT correspondence, this gravitational relation implies a series of nontrivial constraints on the spectra of QFTs exhibiting S-duality (or particle–vortex duality), as well as on conformal field theories with double-trace deformations. As part of my talk, I will also discuss a few other properties of such thermal QFT spectra, and how their analytic reconstruction can be understood, within the language of the AdS/CFT correspondence, through the phenomenon of pole-skipping.